Can't connect to 127.0.0.1 on another container with the same network after restart

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I’ve a simple docker-compose file:

version: '3.4'

services:
  vpn:
    image: dperson/openvpn-client
    cap_add:
      - net_admin
    networks:
      - default
    read_only: true
    tmpfs:
      - /run
      - /tmp
    restart: unless-stopped
    security_opt:
      - label:disable
    stdin_open: true
    tty: true
    volumes:
      - /dev/net:/dev/net:z
      - ./vpn-config:/vpn

  service1:
    image: consol/centos-xfce-vnc
    depends_on:
      - vpn
    network_mode: "service:vpn"
    restart: unless-stopped


networks:
  default:

after vpn starts, service1 is started, if I do a docker-compose exec vpn sh and I try to connect to 127.0.0.1:5901 I successfully connect to the other container.

If for some reason openvpn is restarted (e.g. loss of connectivity) it seems like the link between the containers is lost and connecting to 127.0.0.1:5901 gives connection refused.

Any idea?